Update to net 9.0

Author: BarRaider

TestClient/TestClient.csproj

@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<OutputType>WinExe</OutputType>
-		<TargetFramework>netcoreapp3.1</TargetFramework>
+		<TargetFramework>net9.0-windows7.0</TargetFramework>
 		<AssemblyName>TestClient</AssemblyName>
 		<RootNamespace>TestClient</RootNamespace>
 		<LangVersion>8</LangVersion>

obs-websocket-dotnet-tests/obs-websocket-dotnet-tests.csproj

@@ -1,18 +1,18 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFramework>netcoreapp3.1</TargetFramework>
+		<TargetFramework>net9.0</TargetFramework>
 		<AssemblyName>obs-websocket-dotnet-tests</AssemblyName>
 		<RootNamespace>OBSWebsocketDotNet.Tests</RootNamespace>
 		<Copyright>Copyright © Stéphane Lepin, BarRaider 2021</Copyright>
 		<LangVersion>8</LangVersion>
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
-		<PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
-		<PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
-		<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
+		<PackageReference Include="MSTest.TestAdapter" Version="3.8.3" />
+		<PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
+		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
 		<PackageReference Include="WebSocketSharp-netstandard" Version="1.0.1" />
 	</ItemGroup>